116846ebeSHaibo Chen /* 216846ebeSHaibo Chen * Freescale i.MX7D ADC driver 316846ebeSHaibo Chen * 416846ebeSHaibo Chen * Copyright (C) 2015 Freescale Semiconductor, Inc. 516846ebeSHaibo Chen * 616846ebeSHaibo Chen * This program is free software; you can redistribute it and/or modify 716846ebeSHaibo Chen * it under the terms of the GNU General Public License as published by 816846ebeSHaibo Chen * the Free Software Foundation; either version 2 of the License, or 916846ebeSHaibo Chen * (at your option) any later version. 1016846ebeSHaibo Chen */ 1116846ebeSHaibo Chen 1216846ebeSHaibo Chen #include <linux/clk.h> 1316846ebeSHaibo Chen #include <linux/completion.h> 1416846ebeSHaibo Chen #include <linux/err.h> 1516846ebeSHaibo Chen #include <linux/interrupt.h> 1616846ebeSHaibo Chen #include <linux/io.h> 1716846ebeSHaibo Chen #include <linux/kernel.h> 1816846ebeSHaibo Chen #include <linux/module.h> 1916846ebeSHaibo Chen #include <linux/platform_device.h> 2016846ebeSHaibo Chen #include <linux/regulator/consumer.h> 2116846ebeSHaibo Chen 2216846ebeSHaibo Chen #include <linux/iio/iio.h> 2316846ebeSHaibo Chen #include <linux/iio/driver.h> 2416846ebeSHaibo Chen #include <linux/iio/sysfs.h> 2516846ebeSHaibo Chen 2616846ebeSHaibo Chen /* ADC register */ 2716846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_A_CFG1 0x00 2816846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_A_CFG2 0x10 2916846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_B_CFG1 0x20 3016846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_B_CFG2 0x30 3116846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_C_CFG1 0x40 3216846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_C_CFG2 0x50 3316846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_D_CFG1 0x60 3416846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_D_CFG2 0x70 3516846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_SW_CFG 0x80 3616846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT 0x90 3716846ebeSHaibo Chen #define IMX7D_REG_ADC_DMA_FIFO 0xa0 3816846ebeSHaibo Chen #define IMX7D_REG_ADC_FIFO_STATUS 0xb0 3916846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_SIG_EN 0xc0 4016846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_EN 0xd0 4116846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_STATUS 0xe0 4216846ebeSHaibo Chen #define IMX7D_REG_ADC_CHA_B_CNV_RSLT 0xf0 4316846ebeSHaibo Chen #define IMX7D_REG_ADC_CHC_D_CNV_RSLT 0x100 4416846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_SW_CNV_RSLT 0x110 4516846ebeSHaibo Chen #define IMX7D_REG_ADC_DMA_FIFO_DAT 0x120 4616846ebeSHaibo Chen #define IMX7D_REG_ADC_ADC_CFG 0x130 4716846ebeSHaibo Chen 4816846ebeSHaibo Chen #define IMX7D_REG_ADC_CHANNEL_CFG2_BASE 0x10 4916846ebeSHaibo Chen #define IMX7D_EACH_CHANNEL_REG_OFFSET 0x20 5016846ebeSHaibo Chen 5116846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN (0x1 << 31) 5216846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE BIT(30) 5316846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN BIT(29) 5416846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_SEL(x) ((x) << 24) 5516846ebeSHaibo Chen 5616846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_4 (0x0 << 12) 5716846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_8 (0x1 << 12) 5816846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_16 (0x2 << 12) 5916846ebeSHaibo Chen #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_32 (0x3 << 12) 6016846ebeSHaibo Chen 6116846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_4 (0x0 << 29) 6216846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_8 (0x1 << 29) 6316846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_16 (0x2 << 29) 6416846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_32 (0x3 << 29) 6516846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_64 (0x4 << 29) 6616846ebeSHaibo Chen #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_128 (0x5 << 29) 6716846ebeSHaibo Chen 6816846ebeSHaibo Chen #define IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN BIT(31) 6916846ebeSHaibo Chen #define IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN BIT(1) 7016846ebeSHaibo Chen #define IMX7D_REG_ADC_ADC_CFG_ADC_EN BIT(0) 7116846ebeSHaibo Chen 7216846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_CHA_COV_INT_EN BIT(8) 7316846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_CHB_COV_INT_EN BIT(9) 7416846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_CHC_COV_INT_EN BIT(10) 7516846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_CHD_COV_INT_EN BIT(11) 7616846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_CHANNEL_INT_EN \ 7716846ebeSHaibo Chen (IMX7D_REG_ADC_INT_CHA_COV_INT_EN | \ 7816846ebeSHaibo Chen IMX7D_REG_ADC_INT_CHB_COV_INT_EN | \ 7916846ebeSHaibo Chen IMX7D_REG_ADC_INT_CHC_COV_INT_EN | \ 8016846ebeSHaibo Chen IMX7D_REG_ADC_INT_CHD_COV_INT_EN) 8116846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS 0xf00 8216846ebeSHaibo Chen #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT 0xf0000 8316846ebeSHaibo Chen 8416846ebeSHaibo Chen #define IMX7D_ADC_TIMEOUT msecs_to_jiffies(100) 859ce92da8SFabio Estevam #define IMX7D_ADC_INPUT_CLK 24000000 8616846ebeSHaibo Chen 8716846ebeSHaibo Chen enum imx7d_adc_clk_pre_div { 8816846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_4, 8916846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_8, 9016846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_16, 9116846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_32, 9216846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_64, 9316846ebeSHaibo Chen IMX7D_ADC_ANALOG_CLK_PRE_DIV_128, 9416846ebeSHaibo Chen }; 9516846ebeSHaibo Chen 9616846ebeSHaibo Chen enum imx7d_adc_average_num { 9716846ebeSHaibo Chen IMX7D_ADC_AVERAGE_NUM_4, 9816846ebeSHaibo Chen IMX7D_ADC_AVERAGE_NUM_8, 9916846ebeSHaibo Chen IMX7D_ADC_AVERAGE_NUM_16, 10016846ebeSHaibo Chen IMX7D_ADC_AVERAGE_NUM_32, 10116846ebeSHaibo Chen }; 10216846ebeSHaibo Chen 10316846ebeSHaibo Chen struct imx7d_adc_feature { 10416846ebeSHaibo Chen enum imx7d_adc_clk_pre_div clk_pre_div; 10516846ebeSHaibo Chen enum imx7d_adc_average_num avg_num; 10616846ebeSHaibo Chen 10716846ebeSHaibo Chen u32 core_time_unit; /* impact the sample rate */ 10816846ebeSHaibo Chen }; 10916846ebeSHaibo Chen 11016846ebeSHaibo Chen struct imx7d_adc { 11116846ebeSHaibo Chen struct device *dev; 11216846ebeSHaibo Chen void __iomem *regs; 11316846ebeSHaibo Chen struct clk *clk; 11416846ebeSHaibo Chen 11516846ebeSHaibo Chen u32 vref_uv; 11616846ebeSHaibo Chen u32 value; 11716846ebeSHaibo Chen u32 channel; 11816846ebeSHaibo Chen u32 pre_div_num; 11916846ebeSHaibo Chen 12016846ebeSHaibo Chen struct regulator *vref; 12116846ebeSHaibo Chen struct imx7d_adc_feature adc_feature; 12216846ebeSHaibo Chen 12316846ebeSHaibo Chen struct completion completion; 12416846ebeSHaibo Chen }; 12516846ebeSHaibo Chen 12616846ebeSHaibo Chen struct imx7d_adc_analogue_core_clk { 12716846ebeSHaibo Chen u32 pre_div; 12816846ebeSHaibo Chen u32 reg_config; 12916846ebeSHaibo Chen }; 13016846ebeSHaibo Chen 13116846ebeSHaibo Chen #define IMX7D_ADC_ANALOGUE_CLK_CONFIG(_pre_div, _reg_conf) { \ 13216846ebeSHaibo Chen .pre_div = (_pre_div), \ 13316846ebeSHaibo Chen .reg_config = (_reg_conf), \ 13416846ebeSHaibo Chen } 13516846ebeSHaibo Chen 13616846ebeSHaibo Chen static const struct imx7d_adc_analogue_core_clk imx7d_adc_analogue_clk[] = { 13716846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(4, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_4), 13816846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(8, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_8), 13916846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(16, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_16), 14016846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(32, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_32), 14116846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(64, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_64), 14216846ebeSHaibo Chen IMX7D_ADC_ANALOGUE_CLK_CONFIG(128, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_128), 14316846ebeSHaibo Chen }; 14416846ebeSHaibo Chen 14516846ebeSHaibo Chen #define IMX7D_ADC_CHAN(_idx) { \ 14616846ebeSHaibo Chen .type = IIO_VOLTAGE, \ 14716846ebeSHaibo Chen .indexed = 1, \ 14816846ebeSHaibo Chen .channel = (_idx), \ 14916846ebeSHaibo Chen .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 15016846ebeSHaibo Chen .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 15116846ebeSHaibo Chen BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 15216846ebeSHaibo Chen } 15316846ebeSHaibo Chen 15416846ebeSHaibo Chen static const struct iio_chan_spec imx7d_adc_iio_channels[] = { 15516846ebeSHaibo Chen IMX7D_ADC_CHAN(0), 15616846ebeSHaibo Chen IMX7D_ADC_CHAN(1), 15716846ebeSHaibo Chen IMX7D_ADC_CHAN(2), 15816846ebeSHaibo Chen IMX7D_ADC_CHAN(3), 15916846ebeSHaibo Chen IMX7D_ADC_CHAN(4), 16016846ebeSHaibo Chen IMX7D_ADC_CHAN(5), 16116846ebeSHaibo Chen IMX7D_ADC_CHAN(6), 16216846ebeSHaibo Chen IMX7D_ADC_CHAN(7), 16316846ebeSHaibo Chen IMX7D_ADC_CHAN(8), 16416846ebeSHaibo Chen IMX7D_ADC_CHAN(9), 16516846ebeSHaibo Chen IMX7D_ADC_CHAN(10), 16616846ebeSHaibo Chen IMX7D_ADC_CHAN(11), 16716846ebeSHaibo Chen IMX7D_ADC_CHAN(12), 16816846ebeSHaibo Chen IMX7D_ADC_CHAN(13), 16916846ebeSHaibo Chen IMX7D_ADC_CHAN(14), 17016846ebeSHaibo Chen IMX7D_ADC_CHAN(15), 17116846ebeSHaibo Chen }; 17216846ebeSHaibo Chen 17316846ebeSHaibo Chen static const u32 imx7d_adc_average_num[] = { 17416846ebeSHaibo Chen IMX7D_REG_ADC_CH_CFG2_AVG_NUM_4, 17516846ebeSHaibo Chen IMX7D_REG_ADC_CH_CFG2_AVG_NUM_8, 17616846ebeSHaibo Chen IMX7D_REG_ADC_CH_CFG2_AVG_NUM_16, 17716846ebeSHaibo Chen IMX7D_REG_ADC_CH_CFG2_AVG_NUM_32, 17816846ebeSHaibo Chen }; 17916846ebeSHaibo Chen 18016846ebeSHaibo Chen static void imx7d_adc_feature_config(struct imx7d_adc *info) 18116846ebeSHaibo Chen { 18216846ebeSHaibo Chen info->adc_feature.clk_pre_div = IMX7D_ADC_ANALOG_CLK_PRE_DIV_4; 18316846ebeSHaibo Chen info->adc_feature.avg_num = IMX7D_ADC_AVERAGE_NUM_32; 18416846ebeSHaibo Chen info->adc_feature.core_time_unit = 1; 18516846ebeSHaibo Chen } 18616846ebeSHaibo Chen 18716846ebeSHaibo Chen static void imx7d_adc_sample_rate_set(struct imx7d_adc *info) 18816846ebeSHaibo Chen { 18916846ebeSHaibo Chen struct imx7d_adc_feature *adc_feature = &info->adc_feature; 19016846ebeSHaibo Chen struct imx7d_adc_analogue_core_clk adc_analogure_clk; 19116846ebeSHaibo Chen u32 i; 19216846ebeSHaibo Chen u32 tmp_cfg1; 19316846ebeSHaibo Chen u32 sample_rate = 0; 19416846ebeSHaibo Chen 19516846ebeSHaibo Chen /* 19616846ebeSHaibo Chen * Before sample set, disable channel A,B,C,D. Here we 19716846ebeSHaibo Chen * clear the bit 31 of register REG_ADC_CH_A\B\C\D_CFG1. 19816846ebeSHaibo Chen */ 19916846ebeSHaibo Chen for (i = 0; i < 4; i++) { 20016846ebeSHaibo Chen tmp_cfg1 = 20116846ebeSHaibo Chen readl(info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET); 20216846ebeSHaibo Chen tmp_cfg1 &= ~IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN; 20316846ebeSHaibo Chen writel(tmp_cfg1, 20416846ebeSHaibo Chen info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET); 20516846ebeSHaibo Chen } 20616846ebeSHaibo Chen 20716846ebeSHaibo Chen adc_analogure_clk = imx7d_adc_analogue_clk[adc_feature->clk_pre_div]; 20816846ebeSHaibo Chen sample_rate |= adc_analogure_clk.reg_config; 20916846ebeSHaibo Chen info->pre_div_num = adc_analogure_clk.pre_div; 21016846ebeSHaibo Chen 21116846ebeSHaibo Chen sample_rate |= adc_feature->core_time_unit; 21216846ebeSHaibo Chen writel(sample_rate, info->regs + IMX7D_REG_ADC_TIMER_UNIT); 21316846ebeSHaibo Chen } 21416846ebeSHaibo Chen 21516846ebeSHaibo Chen static void imx7d_adc_hw_init(struct imx7d_adc *info) 21616846ebeSHaibo Chen { 21716846ebeSHaibo Chen u32 cfg; 21816846ebeSHaibo Chen 21916846ebeSHaibo Chen /* power up and enable adc analogue core */ 22016846ebeSHaibo Chen cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG); 22116846ebeSHaibo Chen cfg &= ~(IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN | 22216846ebeSHaibo Chen IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN); 22316846ebeSHaibo Chen cfg |= IMX7D_REG_ADC_ADC_CFG_ADC_EN; 22416846ebeSHaibo Chen writel(cfg, info->regs + IMX7D_REG_ADC_ADC_CFG); 22516846ebeSHaibo Chen 22616846ebeSHaibo Chen /* enable channel A,B,C,D interrupt */ 22716846ebeSHaibo Chen writel(IMX7D_REG_ADC_INT_CHANNEL_INT_EN, 22816846ebeSHaibo Chen info->regs + IMX7D_REG_ADC_INT_SIG_EN); 22916846ebeSHaibo Chen writel(IMX7D_REG_ADC_INT_CHANNEL_INT_EN, 23016846ebeSHaibo Chen info->regs + IMX7D_REG_ADC_INT_EN); 23116846ebeSHaibo Chen 23216846ebeSHaibo Chen imx7d_adc_sample_rate_set(info); 23316846ebeSHaibo Chen } 23416846ebeSHaibo Chen 23516846ebeSHaibo Chen static void imx7d_adc_channel_set(struct imx7d_adc *info) 23616846ebeSHaibo Chen { 23716846ebeSHaibo Chen u32 cfg1 = 0; 23816846ebeSHaibo Chen u32 cfg2; 23916846ebeSHaibo Chen u32 channel; 24016846ebeSHaibo Chen 24116846ebeSHaibo Chen channel = info->channel; 24216846ebeSHaibo Chen 24316846ebeSHaibo Chen /* the channel choose single conversion, and enable average mode */ 24416846ebeSHaibo Chen cfg1 |= (IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN | 2459f3bf94fSFabio Estevam IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE | 2469f3bf94fSFabio Estevam IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN); 24716846ebeSHaibo Chen 24816846ebeSHaibo Chen /* 24916846ebeSHaibo Chen * physical channel 0 chose logical channel A 25016846ebeSHaibo Chen * physical channel 1 chose logical channel B 25116846ebeSHaibo Chen * physical channel 2 chose logical channel C 25216846ebeSHaibo Chen * physical channel 3 chose logical channel D 25316846ebeSHaibo Chen */ 25416846ebeSHaibo Chen cfg1 |= IMX7D_REG_ADC_CH_CFG1_CHANNEL_SEL(channel); 25516846ebeSHaibo Chen 25616846ebeSHaibo Chen /* 25716846ebeSHaibo Chen * read register REG_ADC_CH_A\B\C\D_CFG2, according to the 25816846ebeSHaibo Chen * channel chosen 25916846ebeSHaibo Chen */ 26016846ebeSHaibo Chen cfg2 = readl(info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel + 26116846ebeSHaibo Chen IMX7D_REG_ADC_CHANNEL_CFG2_BASE); 26216846ebeSHaibo Chen 26316846ebeSHaibo Chen cfg2 |= imx7d_adc_average_num[info->adc_feature.avg_num]; 26416846ebeSHaibo Chen 26516846ebeSHaibo Chen /* 26616846ebeSHaibo Chen * write the register REG_ADC_CH_A\B\C\D_CFG2, according to 26716846ebeSHaibo Chen * the channel chosen 26816846ebeSHaibo Chen */ 26916846ebeSHaibo Chen writel(cfg2, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel + 27016846ebeSHaibo Chen IMX7D_REG_ADC_CHANNEL_CFG2_BASE); 27116846ebeSHaibo Chen writel(cfg1, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel); 27216846ebeSHaibo Chen } 27316846ebeSHaibo Chen 27416846ebeSHaibo Chen static u32 imx7d_adc_get_sample_rate(struct imx7d_adc *info) 27516846ebeSHaibo Chen { 27616846ebeSHaibo Chen u32 analogue_core_clk; 27716846ebeSHaibo Chen u32 core_time_unit = info->adc_feature.core_time_unit; 27816846ebeSHaibo Chen u32 tmp; 27916846ebeSHaibo Chen 2809ce92da8SFabio Estevam analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num; 28116846ebeSHaibo Chen tmp = (core_time_unit + 1) * 6; 28216846ebeSHaibo Chen 28316846ebeSHaibo Chen return analogue_core_clk / tmp; 28416846ebeSHaibo Chen } 28516846ebeSHaibo Chen 28616846ebeSHaibo Chen static int imx7d_adc_read_raw(struct iio_dev *indio_dev, 28716846ebeSHaibo Chen struct iio_chan_spec const *chan, 28816846ebeSHaibo Chen int *val, 28916846ebeSHaibo Chen int *val2, 29016846ebeSHaibo Chen long mask) 29116846ebeSHaibo Chen { 29216846ebeSHaibo Chen struct imx7d_adc *info = iio_priv(indio_dev); 29316846ebeSHaibo Chen 29416846ebeSHaibo Chen u32 channel; 29516846ebeSHaibo Chen long ret; 29616846ebeSHaibo Chen 29716846ebeSHaibo Chen switch (mask) { 29816846ebeSHaibo Chen case IIO_CHAN_INFO_RAW: 29916846ebeSHaibo Chen mutex_lock(&indio_dev->mlock); 30016846ebeSHaibo Chen reinit_completion(&info->completion); 30116846ebeSHaibo Chen 30216846ebeSHaibo Chen channel = chan->channel & 0x03; 30316846ebeSHaibo Chen info->channel = channel; 30416846ebeSHaibo Chen imx7d_adc_channel_set(info); 30516846ebeSHaibo Chen 30616846ebeSHaibo Chen ret = wait_for_completion_interruptible_timeout 30716846ebeSHaibo Chen (&info->completion, IMX7D_ADC_TIMEOUT); 30816846ebeSHaibo Chen if (ret == 0) { 30916846ebeSHaibo Chen mutex_unlock(&indio_dev->mlock); 31016846ebeSHaibo Chen return -ETIMEDOUT; 31116846ebeSHaibo Chen } 31216846ebeSHaibo Chen if (ret < 0) { 31316846ebeSHaibo Chen mutex_unlock(&indio_dev->mlock); 31416846ebeSHaibo Chen return ret; 31516846ebeSHaibo Chen } 31616846ebeSHaibo Chen 31716846ebeSHaibo Chen *val = info->value; 31816846ebeSHaibo Chen mutex_unlock(&indio_dev->mlock); 31916846ebeSHaibo Chen return IIO_VAL_INT; 32016846ebeSHaibo Chen 32116846ebeSHaibo Chen case IIO_CHAN_INFO_SCALE: 32216846ebeSHaibo Chen info->vref_uv = regulator_get_voltage(info->vref); 32316846ebeSHaibo Chen *val = info->vref_uv / 1000; 32416846ebeSHaibo Chen *val2 = 12; 32516846ebeSHaibo Chen return IIO_VAL_FRACTIONAL_LOG2; 32616846ebeSHaibo Chen 32716846ebeSHaibo Chen case IIO_CHAN_INFO_SAMP_FREQ: 32816846ebeSHaibo Chen *val = imx7d_adc_get_sample_rate(info); 32916846ebeSHaibo Chen return IIO_VAL_INT; 33016846ebeSHaibo Chen 33116846ebeSHaibo Chen default: 33216846ebeSHaibo Chen return -EINVAL; 33316846ebeSHaibo Chen } 33416846ebeSHaibo Chen } 33516846ebeSHaibo Chen 33616846ebeSHaibo Chen static int imx7d_adc_read_data(struct imx7d_adc *info) 33716846ebeSHaibo Chen { 33816846ebeSHaibo Chen u32 channel; 33916846ebeSHaibo Chen u32 value; 34016846ebeSHaibo Chen 34116846ebeSHaibo Chen channel = info->channel & 0x03; 34216846ebeSHaibo Chen 34316846ebeSHaibo Chen /* 34416846ebeSHaibo Chen * channel A and B conversion result share one register, 34516846ebeSHaibo Chen * bit[27~16] is the channel B conversion result, 34616846ebeSHaibo Chen * bit[11~0] is the channel A conversion result. 34716846ebeSHaibo Chen * channel C and D is the same. 34816846ebeSHaibo Chen */ 34916846ebeSHaibo Chen if (channel < 2) 35016846ebeSHaibo Chen value = readl(info->regs + IMX7D_REG_ADC_CHA_B_CNV_RSLT); 35116846ebeSHaibo Chen else 35216846ebeSHaibo Chen value = readl(info->regs + IMX7D_REG_ADC_CHC_D_CNV_RSLT); 35316846ebeSHaibo Chen if (channel & 0x1) /* channel B or D */ 35416846ebeSHaibo Chen value = (value >> 16) & 0xFFF; 35516846ebeSHaibo Chen else /* channel A or C */ 35616846ebeSHaibo Chen value &= 0xFFF; 35716846ebeSHaibo Chen 35816846ebeSHaibo Chen return value; 35916846ebeSHaibo Chen } 36016846ebeSHaibo Chen 36116846ebeSHaibo Chen static irqreturn_t imx7d_adc_isr(int irq, void *dev_id) 36216846ebeSHaibo Chen { 3630b568b3cSsimran singhal struct imx7d_adc *info = dev_id; 36416846ebeSHaibo Chen int status; 36516846ebeSHaibo Chen 36616846ebeSHaibo Chen status = readl(info->regs + IMX7D_REG_ADC_INT_STATUS); 36716846ebeSHaibo Chen if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS) { 36816846ebeSHaibo Chen info->value = imx7d_adc_read_data(info); 36916846ebeSHaibo Chen complete(&info->completion); 37016846ebeSHaibo Chen 37116846ebeSHaibo Chen /* 37216846ebeSHaibo Chen * The register IMX7D_REG_ADC_INT_STATUS can't clear 37316846ebeSHaibo Chen * itself after read operation, need software to write 37416846ebeSHaibo Chen * 0 to the related bit. Here we clear the channel A/B/C/D 37516846ebeSHaibo Chen * conversion finished flag. 37616846ebeSHaibo Chen */ 37716846ebeSHaibo Chen status &= ~IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS; 37816846ebeSHaibo Chen writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS); 37916846ebeSHaibo Chen } 38016846ebeSHaibo Chen 38116846ebeSHaibo Chen /* 38216846ebeSHaibo Chen * If the channel A/B/C/D conversion timeout, report it and clear these 38316846ebeSHaibo Chen * timeout flags. 38416846ebeSHaibo Chen */ 38516846ebeSHaibo Chen if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT) { 3868cc393bfSAndrey Smirnov dev_err(info->dev, 3878cc393bfSAndrey Smirnov "ADC got conversion time out interrupt: 0x%08x\n", 3888cc393bfSAndrey Smirnov status); 38916846ebeSHaibo Chen status &= ~IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT; 39016846ebeSHaibo Chen writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS); 39116846ebeSHaibo Chen } 39216846ebeSHaibo Chen 39316846ebeSHaibo Chen return IRQ_HANDLED; 39416846ebeSHaibo Chen } 39516846ebeSHaibo Chen 39616846ebeSHaibo Chen static int imx7d_adc_reg_access(struct iio_dev *indio_dev, 39716846ebeSHaibo Chen unsigned reg, unsigned writeval, 39816846ebeSHaibo Chen unsigned *readval) 39916846ebeSHaibo Chen { 40016846ebeSHaibo Chen struct imx7d_adc *info = iio_priv(indio_dev); 40116846ebeSHaibo Chen 40216846ebeSHaibo Chen if (!readval || reg % 4 || reg > IMX7D_REG_ADC_ADC_CFG) 40316846ebeSHaibo Chen return -EINVAL; 40416846ebeSHaibo Chen 40516846ebeSHaibo Chen *readval = readl(info->regs + reg); 40616846ebeSHaibo Chen 40716846ebeSHaibo Chen return 0; 40816846ebeSHaibo Chen } 40916846ebeSHaibo Chen 41016846ebeSHaibo Chen static const struct iio_info imx7d_adc_iio_info = { 41116846ebeSHaibo Chen .read_raw = &imx7d_adc_read_raw, 41216846ebeSHaibo Chen .debugfs_reg_access = &imx7d_adc_reg_access, 41316846ebeSHaibo Chen }; 41416846ebeSHaibo Chen 41516846ebeSHaibo Chen static const struct of_device_id imx7d_adc_match[] = { 41616846ebeSHaibo Chen { .compatible = "fsl,imx7d-adc", }, 41716846ebeSHaibo Chen { /* sentinel */ } 41816846ebeSHaibo Chen }; 41916846ebeSHaibo Chen MODULE_DEVICE_TABLE(of, imx7d_adc_match); 42016846ebeSHaibo Chen 42116846ebeSHaibo Chen static void imx7d_adc_power_down(struct imx7d_adc *info) 42216846ebeSHaibo Chen { 42316846ebeSHaibo Chen u32 adc_cfg; 42416846ebeSHaibo Chen 42516846ebeSHaibo Chen adc_cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG); 42616846ebeSHaibo Chen adc_cfg |= IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN | 42716846ebeSHaibo Chen IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN; 42816846ebeSHaibo Chen adc_cfg &= ~IMX7D_REG_ADC_ADC_CFG_ADC_EN; 42916846ebeSHaibo Chen writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG); 43016846ebeSHaibo Chen } 43116846ebeSHaibo Chen 4324fe86cdfSAndrey Smirnov static int imx7d_adc_enable(struct device *dev) 4334fe86cdfSAndrey Smirnov { 4344fe86cdfSAndrey Smirnov struct iio_dev *indio_dev = dev_get_drvdata(dev); 4354fe86cdfSAndrey Smirnov struct imx7d_adc *info = iio_priv(indio_dev); 4364fe86cdfSAndrey Smirnov int ret; 4374fe86cdfSAndrey Smirnov 4384fe86cdfSAndrey Smirnov ret = regulator_enable(info->vref); 4394fe86cdfSAndrey Smirnov if (ret) { 4404fe86cdfSAndrey Smirnov dev_err(info->dev, 4414fe86cdfSAndrey Smirnov "Can't enable adc reference top voltage, err = %d\n", 4424fe86cdfSAndrey Smirnov ret); 4434fe86cdfSAndrey Smirnov return ret; 4444fe86cdfSAndrey Smirnov } 4454fe86cdfSAndrey Smirnov 4464fe86cdfSAndrey Smirnov ret = clk_prepare_enable(info->clk); 4474fe86cdfSAndrey Smirnov if (ret) { 4484fe86cdfSAndrey Smirnov dev_err(info->dev, 4494fe86cdfSAndrey Smirnov "Could not prepare or enable clock.\n"); 4504fe86cdfSAndrey Smirnov regulator_disable(info->vref); 4514fe86cdfSAndrey Smirnov return ret; 4524fe86cdfSAndrey Smirnov } 4534fe86cdfSAndrey Smirnov 4544fe86cdfSAndrey Smirnov imx7d_adc_hw_init(info); 4554fe86cdfSAndrey Smirnov 4564fe86cdfSAndrey Smirnov return 0; 4574fe86cdfSAndrey Smirnov } 4584fe86cdfSAndrey Smirnov 459b8466760SAndrey Smirnov static int imx7d_adc_disable(struct device *dev) 460b8466760SAndrey Smirnov { 461b8466760SAndrey Smirnov struct iio_dev *indio_dev = dev_get_drvdata(dev); 462b8466760SAndrey Smirnov struct imx7d_adc *info = iio_priv(indio_dev); 463b8466760SAndrey Smirnov 464b8466760SAndrey Smirnov imx7d_adc_power_down(info); 465b8466760SAndrey Smirnov 466b8466760SAndrey Smirnov clk_disable_unprepare(info->clk); 467b8466760SAndrey Smirnov regulator_disable(info->vref); 468b8466760SAndrey Smirnov 469b8466760SAndrey Smirnov return 0; 470b8466760SAndrey Smirnov } 471b8466760SAndrey Smirnov 472b8466760SAndrey Smirnov static void __imx7d_adc_disable(void *data) 473b8466760SAndrey Smirnov { 474b8466760SAndrey Smirnov imx7d_adc_disable(data); 475b8466760SAndrey Smirnov } 476b8466760SAndrey Smirnov 47716846ebeSHaibo Chen static int imx7d_adc_probe(struct platform_device *pdev) 47816846ebeSHaibo Chen { 47916846ebeSHaibo Chen struct imx7d_adc *info; 48016846ebeSHaibo Chen struct iio_dev *indio_dev; 481aa21a28eSAndrey Smirnov struct device *dev = &pdev->dev; 48216846ebeSHaibo Chen int irq; 48316846ebeSHaibo Chen int ret; 48416846ebeSHaibo Chen 485aa21a28eSAndrey Smirnov indio_dev = devm_iio_device_alloc(dev, sizeof(*info)); 48616846ebeSHaibo Chen if (!indio_dev) { 48716846ebeSHaibo Chen dev_err(&pdev->dev, "Failed allocating iio device\n"); 48816846ebeSHaibo Chen return -ENOMEM; 48916846ebeSHaibo Chen } 49016846ebeSHaibo Chen 49116846ebeSHaibo Chen info = iio_priv(indio_dev); 492aa21a28eSAndrey Smirnov info->dev = dev; 49316846ebeSHaibo Chen 494a8427a7bSAndrey Smirnov info->regs = devm_platform_ioremap_resource(pdev, 0); 495fe931164SFabio Estevam if (IS_ERR(info->regs)) 496fe931164SFabio Estevam return PTR_ERR(info->regs); 49716846ebeSHaibo Chen 49816846ebeSHaibo Chen irq = platform_get_irq(pdev, 0); 49916846ebeSHaibo Chen if (irq < 0) { 500aa21a28eSAndrey Smirnov dev_err(dev, "No irq resource?\n"); 50116846ebeSHaibo Chen return irq; 50216846ebeSHaibo Chen } 50316846ebeSHaibo Chen 504aa21a28eSAndrey Smirnov info->clk = devm_clk_get(dev, "adc"); 50516846ebeSHaibo Chen if (IS_ERR(info->clk)) { 50616846ebeSHaibo Chen ret = PTR_ERR(info->clk); 507aa21a28eSAndrey Smirnov dev_err(dev, "Failed getting clock, err = %d\n", ret); 50816846ebeSHaibo Chen return ret; 50916846ebeSHaibo Chen } 51016846ebeSHaibo Chen 511aa21a28eSAndrey Smirnov info->vref = devm_regulator_get(dev, "vref"); 51216846ebeSHaibo Chen if (IS_ERR(info->vref)) { 51316846ebeSHaibo Chen ret = PTR_ERR(info->vref); 514aa21a28eSAndrey Smirnov dev_err(dev, 51516846ebeSHaibo Chen "Failed getting reference voltage, err = %d\n", ret); 51616846ebeSHaibo Chen return ret; 51716846ebeSHaibo Chen } 51816846ebeSHaibo Chen 51916846ebeSHaibo Chen platform_set_drvdata(pdev, indio_dev); 52016846ebeSHaibo Chen 52116846ebeSHaibo Chen init_completion(&info->completion); 52216846ebeSHaibo Chen 523aa21a28eSAndrey Smirnov indio_dev->name = dev_name(dev); 524aa21a28eSAndrey Smirnov indio_dev->dev.parent = dev; 52516846ebeSHaibo Chen indio_dev->info = &imx7d_adc_iio_info; 52616846ebeSHaibo Chen indio_dev->modes = INDIO_DIRECT_MODE; 52716846ebeSHaibo Chen indio_dev->channels = imx7d_adc_iio_channels; 52816846ebeSHaibo Chen indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels); 52916846ebeSHaibo Chen 530f5d2f9c2SFabio Estevam ret = devm_request_irq(dev, irq, imx7d_adc_isr, 0, dev_name(dev), info); 53116846ebeSHaibo Chen if (ret < 0) { 532aa21a28eSAndrey Smirnov dev_err(dev, "Failed requesting irq, irq = %d\n", irq); 5334fe86cdfSAndrey Smirnov return ret; 53416846ebeSHaibo Chen } 53516846ebeSHaibo Chen 53616846ebeSHaibo Chen imx7d_adc_feature_config(info); 5374fe86cdfSAndrey Smirnov 5384fe86cdfSAndrey Smirnov ret = imx7d_adc_enable(&indio_dev->dev); 5394fe86cdfSAndrey Smirnov if (ret) 5404fe86cdfSAndrey Smirnov return ret; 54116846ebeSHaibo Chen 542b8466760SAndrey Smirnov ret = devm_add_action_or_reset(dev, __imx7d_adc_disable, 543b8466760SAndrey Smirnov &indio_dev->dev); 544b8466760SAndrey Smirnov if (ret) 545b8466760SAndrey Smirnov return ret; 546b8466760SAndrey Smirnov 5479c612694SAndrey Smirnov ret = devm_iio_device_register(dev, indio_dev); 54816846ebeSHaibo Chen if (ret) { 54916846ebeSHaibo Chen dev_err(&pdev->dev, "Couldn't register the device.\n"); 5504fe86cdfSAndrey Smirnov return ret; 55116846ebeSHaibo Chen } 55216846ebeSHaibo Chen 55316846ebeSHaibo Chen return 0; 55416846ebeSHaibo Chen } 55516846ebeSHaibo Chen 556b8466760SAndrey Smirnov static SIMPLE_DEV_PM_OPS(imx7d_adc_pm_ops, imx7d_adc_disable, imx7d_adc_enable); 55716846ebeSHaibo Chen 55816846ebeSHaibo Chen static struct platform_driver imx7d_adc_driver = { 55916846ebeSHaibo Chen .probe = imx7d_adc_probe, 56016846ebeSHaibo Chen .driver = { 56116846ebeSHaibo Chen .name = "imx7d_adc", 56216846ebeSHaibo Chen .of_match_table = imx7d_adc_match, 56316846ebeSHaibo Chen .pm = &imx7d_adc_pm_ops, 56416846ebeSHaibo Chen }, 56516846ebeSHaibo Chen }; 56616846ebeSHaibo Chen 56716846ebeSHaibo Chen module_platform_driver(imx7d_adc_driver); 56816846ebeSHaibo Chen 56916846ebeSHaibo Chen MODULE_AUTHOR("Haibo Chen <haibo.chen@freescale.com>"); 570dd63b4faSColin Ian King MODULE_DESCRIPTION("Freescale IMX7D ADC driver"); 57116846ebeSHaibo Chen MODULE_LICENSE("GPL v2"); 572